Element getElement(PseudoPath path) {
Element currentElement = fileTree;
for (int i = 0; i < path.getNameCount(); i++) {
currentElement = getChildByName(currentElement, path.getName(i));
if (currentElement == null) return null;
}
return currentElement;
}
public synchronized void addFile(PseudoPath path) {
if (path.equals(new PseudoPath())) {
throw new IllegalArgumentException("Adding empty path does not allowed.");
}
PseudoPath parent = path.getParent();
Element parentElement = getElement(parent);
if (parentElement == null) {
throw new IllegalArgumentException("Parent directory does not exist.");
} else {
Element childElement = new Element(FileType.FILE.getName());
String filename = path.getName(path.getNameCount() - 1);
childElement.addAttribute(new Attribute("name", filename));
parentElement.appendChild(childElement);
}
}
public synchronized void deletePath(PseudoPath path) {
if (path.getNameCount() == 0) {
throw new IllegalArgumentException("Empty path can not be deleted.");
}
Element toBeDeleted = getElement(path);
if (toBeDeleted != null) {
ParentNode parent = toBeDeleted.getParent();
parent.removeChild(toBeDeleted);
}
}
public synchronized void addToDirectory(PseudoPath dir, FSImage child) {
if (!getType(dir).equals(FileType.DIR.getName())) {
throw new IllegalArgumentException("Can add files only to directories.");
}
Element parent = getElement(dir);
Element newChild = new Element(child.fileTree);
String nameOfChildRoot = child.fileTree.getAttributeValue("name");
PseudoPath pathToChild = dir.resolve(nameOfChildRoot);
Element oldChild = getElement(pathToChild);
if (oldChild != null) {
parent.replaceChild(oldChild, newChild);
} else {
parent.appendChild(newChild);
}
}